Phylogeny and clitellar morphology of the giant Amazonian earthworm, rhinodrilus priollii (Oligochaeta: Glossoscolecidae)

Shirley A. Lang, Marcos V. Garcia, Samuel W. James, Charlene W. Sayers, Daniel H. Shain

Research output: Contribution to journalArticlepeer-review

3 Scopus citations

Abstract

The giant earthworm, Rhinodrilus priollii Righi 1967, is among the largest terrestrial invertebrates known worldwide, reaching lengths >2 m. To investigate the evolutionary history of the species and aspects of their reproductive biology, we collected R. priollii specimens from several field sites in central Amazonia. Phylogenetic analyses of 16 individuals using a fragment of cytochrome c oxidase subunit 1 (CO1) identified seven haplotypes that diverged between 28%. Population structures indicate episodes of gene flow between populations and their divergence within the past 12 million years. Histological examination of clitella from sexually mature specimens identified cocoon secretory cells throughout the dorsal and dorsoventral epidermis. Unlike previously described secretory cells, those in R. priollii contained granules with a proteinaceous core covered by external glycosylation. Further, collagenous matrices formed the bulk of swollen clitella while albumin-secreting cells were noticeably absent, collectively suggesting a mechanism of cocoon production somewhat different from that described in other clitellate megadriles.

Original languageEnglish (US)
Pages (from-to)384-395
Number of pages12
JournalAmerican Midland Naturalist
Volume167
Issue number2
DOIs
StatePublished - Apr 1 2012

All Science Journal Classification (ASJC) codes

  • Ecology, Evolution, Behavior and Systematics

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